If you're seeing the same error from 2 entirely different MPI
implementations, it is possible that it is an error in your code.
Ensure that all processes are calling MPI_Bcast with the same
arguments (e.g., count, datatype, root, etc.), even on that 4000th
iteration.
How big are the blocks that you are sending around?
On Dec 5, 2007, at 4:08 AM, alireza ghahremanian wrote:
Dear Friends,
I am writing a matrix multiplication program with MPI. MPI_Bcast does
not broadcast to all processes, in last iteration for block size
greater than a specific size. I test it with both MPICH and OPENMPI.I
have 12 processes which 7 of them are reached to MPI_Bcast but when
master (rank 0) send only 6 of them receive the broadcast (exactly
from
rank 1 to 6) and rank 7 stays in waiting. Surprisingly this happen
only
in iteration 3999 from 4000 and in the rest of cases every thing is
all
right, also if I reduce the block size, which, will be sent, every
thing will be done correctly.
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Jeff Squyres
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